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Ab Initio Study of the Intrinsic Exchange Bias at the SrRuO/SrMnO Interface
Shuai Dong, Qinfang Zhang, Seiji Yunoki +2
In a recent publication (S. Dong et al., Phys. Rev. Lett.103, 127201 (2009)), two (related) mechanisms were proposed to understand the intrinsic exchange bias present in oxides het…
Pairing Symmetries of a Hole-Doped Extended Two-Orbital Model for the Pnictides
Andrew Nicholson, Weihao Ge, José Riera +3
The hole-doped ground state of a recently introduced extended "t-U-J" two-orbital Hubbard model for the Fe-based superconductors is studied via exact diagonalization methods on sma…
Anisotropy of Electrical Transport in Pnictide Superconductors Studied Using Monte Carlo Simulations of the Spin-Fermion Model
Shuhua Liang, Gonzalo Alvarez, Cengiz Şen +2
The undoped three-orbital spin fermion model for the Fe-based superconductors is studied via Monte Carlo techniques in two-dimensional clusters. At low temperatures, the magnetic a…
Microscopic model for the ferroelectric field effect in oxide heterostructures
Shuai Dong, Xiaotian Zhang, Rong Yu +2
A microscopic model Hamiltonian for the ferroelectric field effect is introduced for the study of oxide heterostructures with ferroelectric components. The long-range Coulomb inter…
Study of the magnetic state of KFeSe using the five-orbital Hubbard model in the Hartree-Fock approximation
Qinlong Luo, Andrew Nicholson, José Riera +3
Motivated by the recent discovery of Fe-based superconductors close to an antiferromagnetic insulator in the experimental phase diagram, here the five-orbital Hubbard model (withou…
Complex State Found in the CMR Regime of Models for Colossal Magnetoresistive Manganites
Cengiz Sen, Shuhua Liang, Elbio Dagotto
In this report, we study in detail the competitor to the FM metallic state at electronic density in the CMR regime using the two-orbital double-exchange model with Jahn-Tel…
Optical Conductivity Anisotropy in the Undoped Three-Orbital Hubbard Model for the Pnictides
Xiaotian Zhang, Elbio Dagotto
The resistivity anisotropy unveiled in the study of detwinned single crystals of the undoped 122 pnictides is here studied using the two-dimensional three-orbital Hubbard model in…
Role of Degeneracy, Hybridization, and Nesting in the Properties of Multi-Orbital Systems
Andrew Nicholson, Qinlong Luo, Weihao Ge +5
To understand the role that degeneracy, hybridization, and nesting play in the magnetic and pairing properties of multiorbital Hubbard models we here study numerically two types of…
Antiferromagnetic transitions in `T-like' BiFeO3
G. J. MacDougall, H. M. Christen, W. Siemons +5
Recent studies have reported the existence of an epitaxially-stabilized tetragonal-like ('T-like') monoclinic phase in BiFeO3 thin-films with high levels of compressive strain. Whi…
Time Evolution with the DMRG Algorithm: A Generic Implementation for Strongly Correlated Electronic Systems
G. Alvarez, L. G. G. V. Dias da Silva, E. Ponce +1
A detailed description of the time-step-targetting time evolution method within the DMRG algorithm is presented. The focus of this publication is on the implementation of the algor…
Charge Stripes in the Two-Orbital Hubbard Model for Pnictides
Qinlong Luo, Dao-Xin Yao, Adriana Moreo +1
The two-orbital Hubbard model for the pnictides is studied numerically using the real-space Hartree-Fock approximation on finite clusters. Upon electron doping, states with a nonun…
Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides
Andrew Nicholson, Weihao Ge, Xiaotian Zhang +6
We introduce and study an extended "t-U-J" two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms ex…
Emergent dimensional reduction of the spin sector in a model for narrow-band manganites
Shuhua Liang, Maria Daghofer, Shuai Dong +2
The widely used Double-Exchange model for manganites is shown to support various "striped" phases at filling fractions 1/n (n=3, 4, 5...), in the previously unexplored regime of na…
Multiferroic Properties of CaMnO
Guoquan Zhang, Shuai Dong, Zhibo Yan +5
We report that CaMnO is a new magnetic multiferroic material. The appearance of a ferroelectric polarization coinciding with the magnetic phase transition ( K) s…